Drop deprecated method for backing store from AccessBuilder.

src/compiler/access-builder.cc

Index: src/compiler/access-builder.cc
diff --git a/src/compiler/access-builder.cc b/src/compiler/access-builder.cc
index ac9cfa858b421bbb034c5c1831439c00c320139c..749c04a0c5b1470a37e49513555fa7c44df586d2 100644
--- a/src/compiler/access-builder.cc
+++ b/src/compiler/access-builder.cc
@@ -58,13 +58,6 @@ ElementAccess AccessBuilder::ForFixedArrayElement() {
 
 
 // static
-ElementAccess AccessBuilder::ForBackingStoreElement(MachineType rep) {
-  return {kUntaggedBase, kNonHeapObjectHeaderSize - kHeapObjectTag, Type::Any(),
-          rep};
-}
-
-
-// static
 ElementAccess AccessBuilder::ForTypedArrayElement(ExternalArrayType type,
                                                   bool is_external) {
   BaseTaggedness taggedness = is_external ? kUntaggedBase : kTaggedBase;